Influence of room temperature on magnesium isotope measurements by multi‐collector inductively coupled plasma mass spectrometry

Zhang, Xingchao; Zhang, An-Yu; Zhang, Zhaofeng; Huang, Fang; Yu, Haiying

doi:10.1002/rcm.8122

Cited by 8 publications

(11 citation statements)

References 33 publications

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“…The long-term stability of the temperature in the instrument laboratory is highly important, as any variation may influence the stability of the ICP torch or the ion transportation and further affect the instrumental mass bias, leading to a shift in the Mg isotopic ratios. In this study, we observed that the 26 Mg/ 24 Mg ratio is well correlated with temperature in winter when the outside temperature changes dramatically from daytime to night ( Figure 5).…”

Section: Effects Of Fluctuations In Room Temperaturesupporting

confidence: 50%

“…Samples were introduced to the plasma using an ASX-110 autosampler (Cetac Technologies, Omaha, NE, USA) through a PFA self-aspiration micronebulizer (Thermo Scientific) with an uptake rate of 50-100 μL/min and a Scott double pass quartz glass spray chamber (Thermo Scientific). 24 Mg, 25 Mg, and 26 The isotope ratio data are reported in the δ notation 31 as:…”

Section: Mass Spectrometrymentioning

confidence: 99%

“…18,19,21,22,34 ), because they can not only depress the ionization and throughput of Mg in the plasma and interface region, but also produce "isobaric interference" on the Mg isotopes. Polyatomic species such as 12 C 12 C + , 12 C 13 C + , 40 Ar 12 C 2+ , 12 C 14 N + , 12 C 13 CH + , 23 NaH + and doubly charged species such as 48 Ti 2+ , 48 Ca 2+ , 50 Ti 2+ , 50 Cr 2+ , 52 Cr 2+ are the main isobaric interference for 24 Mg, 25 Mg, and 26 Mg. Polyatomic interferences formed by 12…”

Section: Effects Of Matrix Elementsmentioning

confidence: 99%

“…However, many factors can affect instrumental mass bias, which subsequently reduces the precision and accuracy of Mg isotope analysis. These factors may include mismatching in Mg concentration or acid molarity between samples and standards, spectral interferences, matrix effects, and fluctuations in room temperature . Such effects on measured Mg isotopic ratios have been reported to vary among different MC‐ICP‐MS laboratories (e.g …”

Section: Introductionmentioning

confidence: 99%

“…These factors may include mismatching in Mg concentration or acid molarity between samples and standards, 18,21,22 spectral interferences, 23 matrix effects, 18,19,21 and fluctuations in room temperature. 24 Such effects on measured Mg isotopic ratios have been reported to vary among different MC-ICP-MS laboratories (e.g. 18,19,21,22,25 ).…”

mentioning

confidence: 99%

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High‐precision magnesium isotope analysis of geological and environmental reference materials by multiple‐collector inductively coupled plasma mass spectrometry

Gao

et al. 2019

Rapid Comm Mass Spectrometry

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Rationale High‐precision magnesium (Mg) isotopic analysis for geological and environmental reference materials is a prerequisite to ensure data quality before using Mg isotopes to trace geochemical and environmental processes. However, the Mg‐isotopic ratios of many commonly used reference materials, especially sediments, have rarely been reported. Furthermore, published values for some commonly used reference materials exhibit a significant inconsistency across laboratories and thus need more data comparison. Methods We developed different Mg purification schemes for silicate rocks, high‐Ca carbonates and carbonatites, and high‐Mn samples because of their significantly different matrices. We then used synthetic solutions to evaluate potential effects on measurement using multiple‐collector inductively coupled plasma mass spectrometry (MC‐ICP‐MS). The accuracy and precision of our procedures were assessed by measurement on both synthetic solutions and well‐studied geostandards. Results The three different schemes for routine, high‐Ca, and high‐Mn samples can remove matrices efficiently with nearly 100% Mg yield. However, the presence of acid molarity and concentration mismatch, matrix elements, and fluctuations in room temperature can significantly affect the precision and accuracy of Mg isotope analysis, and must be avoided. The Mg isotopic ratios of reference materials obtained in this study are identical to the previously published values within ±0.06‰, verifying that our procedures are robust. Conclusions This study presented a thorough set of tests for high precision and accuracy of Mg isotope measurements using MC‐ICP‐MS, which demonstrate reproducibility and accuracy better than 0.05‰ for δ25Mg values and 0.06‰ for δ26Mg values. We reported high‐quality Mg isotopic data for 16 geological and environmental reference materials to aid the inter‐laboratory calibration of Mg isotope measurements in the future.

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Section: Effects Of Fluctuations In Room Temperaturesupporting

confidence: 50%

Section: Mass Spectrometrymentioning

confidence: 99%

Section: Effects Of Matrix Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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High‐precision magnesium isotope analysis of geological and environmental reference materials by multiple‐collector inductively coupled plasma mass spectrometry

Gao

et al. 2019

Rapid Comm Mass Spectrometry

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Application of a “Continuous‐Acquisition‐Method” to potassium isotope measurements by multi‐collector inductively coupled plasma mass spectrometry

Sun

Huang

et al. 2021

Rapid Comm Mass Spectrometry

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Rationale The very small mass difference between 41K and 40ArH+ makes the flat, hydride interference‐free peak shoulders very narrow (0.002–0.003 m/z unit), bringing a number of analytical challenges when measuring K isotopic compositions by multi‐collector inductively coupled plasma mass spectrometry (MC‐ICP‐MS). In traditional Sequence Run mode, the parameters are loaded every line of the sequence which can introduce tiny drifts of tune parameters and mass peaks. This may occasionally lead to the failure of K isotope measurements when mass drifts exceed 0.002 m/z unit. It is thus essential to keep the tune parameters, especially the magnet current, very stable to achieve high‐precision K isotopic compositions. Method We developed a “Continuous‐Acquisition‐Method” (CAM) MC‐ICP‐MS Run mode to improve the stability when determining K isotopes. Two sets of experiments were designed: (a) Stability test: measuring a single pure K solution (viz. NIST‐999c) for ~3 h and comparing the stability of the two run modes; and (b) GSB‐K test: measuring our inhouse pure K standard solution (GSB‐K) in both run modes and comparing the accuracy and precision. Results The traditional Sequence Run mode only kept the MC‐ICP‐MS system stable for the first ~1.5 h during the ~3‐h test, with an offset of the mass peaks of ~0.003 m/z unit. The CAM Run mode yielded higher stability during the whole test (~3 h), with a peak shift <0.0004 m/z unit. Measurement of the GSB‐K standard solution in Sequence Run and CAM Run modes gives identical δ41K values when the magnet was kept stable, with the CAM Run mode offering a better precision and keeping the instrument stable for longer time. Conclusions The MC‐ICP‐MS CAM Run mode shows higher stability and better precision. It is, therefore, good for high‐precision K isotope measurements.

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How precise and how accurate can magnesium isotope analysis be by the sample-standard bracketing method?

Wang

Kang

Huang

2023

International Journal of Mass Spectrometry

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Influence of room temperature on magnesium isotope measurements by multi‐collector inductively coupled plasma mass spectrometry

Abstract: The room temperature variation can influence the stability of MC-ICP-MS. Therefore, it is critical to keep the room temperature stable to acquire high-precision and accurate isotopic data when using MC-ICP-MS, especially when using the sample-standard bracketing (SSB) correction method.

Cited by 8 publications

References 33 publications

High‐precision magnesium isotope analysis of geological and environmental reference materials by multiple‐collector inductively coupled plasma mass spectrometry

High‐precision magnesium isotope analysis of geological and environmental reference materials by multiple‐collector inductively coupled plasma mass spectrometry

Application of a “Continuous‐Acquisition‐Method” to potassium isotope measurements by multi‐collector inductively coupled plasma mass spectrometry

How precise and how accurate can magnesium isotope analysis be by the sample-standard bracketing method?

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